Measurement Computing Personal Daq rev.6.0 - Manual (Page 51)

Example 2:
A Personal Daq user knows that a linear relationship exists between the voltage output at "Point A" and the
voltage output at "Point B" in a certain electrical device. The linear relationship is constant. The user
wants to monitor the voltage at "Point B," however; it is inconvenient to connect signal lines in that section
of the apparatus.
The user realizes he can take the reading at "Point A" and use the mx + b equation to solve for
"Point B." In this example, B
Volts
= 1.2x + 0.75 Volts, where B
volts
is the voltage at "Point B" and
x is the voltage at "Point A."
After his acquisition was configured, the user performed the following steps to allow
Personal DaqView to calculate and display B
Volts
.
1. Left-clicked/right-clicked on the units cell for PD1_A01, typed in B:Volts , and hit the
keyboard’s Enter key.
2. Left-clicked/right-clicked on the Scale cell for PD1_A01, typed 1.2 for the Scale, and hit
the keyboard's Enter key.
3. Left-clicked/right-clicked on the Offset cell for PD1_A01, typed 0.75 for the Offset, and
hit the keyboard's Enter key.
4. Used channel PD1_A01 to acquire voltage readings which represented the voltage at
"Point B" (B:Volts).
5. Selected the Digital Meters button (14) on the Main Control Window’s toolbar and
configured the meter to display readings for PD1_A01 (B:Volts) and PD1_A02.
6. Clicked the Update All Indicators button (10) on the Main Control Window’s toolbar and
monitored the readings.
PD1_A01 B:Volts Readings resulting from use of the Scale/Offset Feature.
In this example B:Volts is being displayed on the Analog Input Spreadsheet and in a Digital Meter.
Personal Daq User’s Manual 989394 Personal DaqView 4-9